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I believe Hendrik got the desciption here https://www.quadtonerip.com/Calibration.pdf I was surprised by it, so I tried it (experiment vs theory, lol)

Roy, Linearization does correct everything when doing the process carefully as you say, but I suspect the resultant component curves could be very different. Basically, at any given density, one

Your description of method 2 makes no sense. All the values are simple ratio -- darkness of one ink vs darkness of another ink. So K vs LK and LK vs LLK -- then calculate K vs LLK. It's just

Here is plot after linearization. Minor differences between the two curves, nothing to write home about. Likely multiple sampling and using average values would fix the minor differences.

I think in his example Shilesh demonstrated the difference between the two approaches we are discussing. Curve 1 illustrates *method 1*: Here the printed luminosities of all lighter inks are referred

Hello Roy, Thank you for your comments & thoughts. Amen to experimenting. The curve 1 and 2 renditions come from respective *.quad files data (of course pre-linearization), imported into Excel for

This seems worth some comments. First -- experimenting is the best! Nothing is obvious without trying it. So experimenting and trying things out is always recommended. I'm not really sure where the

I can also make curve 1 behave like curve 2 by changing Highlight from 5 to 0 in the Gray Curve tab. So, I think there is no right or wrong way, rather there are a lot control variables available to

OK, so I did my experiment: * Epson P900, OEM inks * Only used PK, LK, and LLK on Epson Premium Luster * Calibration printed at 70% density * Lmin of LK was 55% step of K * Lmin of LLK was 25% step

Hello Paul, I was only referring to K universally as the darkest ink, whether it be MK or PK. LK and LLK as the next lighter shades. In your write-up, you also refer the lighter density inks in

[email protected]> wrote: Be careful to distinguish between MK and PK. They are different due to the different types of coating on matte paper v. "Photo" (glossy, pearl, semigloss, & satin. I use

I did not know about that guidance. That LK is a fraction of K, and LLK is a fraction of LK (but reflected back in terms of K) . I have made curves from scratch and have not noticed any strange

Dear Shilesh: Thank you very much for your reply. Very helpful, because it clarifies the procedure. What you explain is what I was thinking of, originally. But I was misguided by the descriptions in

Hello Hendrick, I hope this helps. * First, I am not familar with dual K inkset described by Paul Roark. But you mention that you printed at 50% limits on HPR 308, which is a coated MK paper, and

Dear all: I am a beginner and I have a question regarding the determination of the ink densities to be used under the 'Ink Setup' tab when using multiple gray inks. O.k., Paul Roark calls it a

Thought this group would appreciate this comparison. Started the classic cyanotype unit a week ago and several students’ prints came out as the one on the left so I ASSUMED the P900 profile I

Perfect! Thanks Richard!!

https://valleau.art/blog/printer-presets-no-longer-working-right/ Tracy Thanks for this. Very informative. [BTW the current version DXO Photolab 8 creates four presets for the Epson 3880, but gets

Hello They are not the same problem. You can learn more about the presets problem here: https://valleau.art/blog/printer-presets-no-longer-working-right/ Tracy